AP NewsBreak: Suspect's dad: Son was ticking bomb

"Why was he on the run? I'm just trying to hang with it, to make sense of it," he said.

Baker, a 28-year veteran of the force, and Butler, a 10-year veteran, had been shot at and called for backup before arriving officers found Goulet, who was killed after opening fire on them, authorities said.

A concrete wall at the site was riddled with bullet holes and splattered with blood. The shots on the wall and a garage were marked with identifying letters placed by police that went from "A" to "K."

Baker's son, Adam Baker, served as a community service officer, and father and son had mailboxes side-by-side at the Police Department.

Loran Baker told the Santa Cruz Sentinel in 2010 that his son's choice to pursue a career in law enforcement surprised him, but he saw glimpses of himself in Adam.

Loran Baker said he told his son to work hard for the department.

"It's a great community to be a cop," he said. "You don't get bored."

Butler came to Santa Cruz to study at the university and stayed, the newspaper said.

"You have to be a people person down here," she told the newspaper in a 2005 interview. "I really do know people's names."

After the shootings, police went door-to-door in the neighborhood, searching homes, garages, even closets, to determine whether there might be additional suspects.

Law enforcement officers filled intersections, and helicopters and light aircraft patrolled the neighborhood.

Mayor Hilary Bryant said the community was "heartbroken at the loss of two of our finest police officers who were killed in the line of duty, protecting the community we love."

The recent violence in Santa Cruz included the killing of a 32-year-old martial arts instructor who was shot outside a popular downtown bar and restaurant; the robbery of a student at the University of California, Santa Cruz, who was shot in the head; a 21-year-old woman who was raped and beaten on the UC campus; and a couple who fought off two men during a home invasion.

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Associated Press writer John S. Marshall in San Francisco contributed to this report.